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No electronic equipment should be uswd during electrical storms. There is always a fuse at the back of the device. Unscrew it and check the glass viol for a broken wire inside. If yes, then replace it with the same specification viol. If not then the damage is serious and needs professional help.
You can increase the capacity of the batteries from the original equipment, but you cannot put more load onto the UPS. Your runtime may be increased, but you may have trouble fitting the car batteries into the case. Some UPS's have external connectors for external battery packs. Find one of those and add the batteries to it. Make sure that you maintain the DC voltage which the UPS requires. It may be 12 volts or 24volts. Two 12 volt batteries in Series.